US6826503B2 - Physical quantity detection equipment - Google Patents

Physical quantity detection equipment Download PDF

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Publication number
US6826503B2
US6826503B2 US10/602,816 US60281603A US6826503B2 US 6826503 B2 US6826503 B2 US 6826503B2 US 60281603 A US60281603 A US 60281603A US 6826503 B2 US6826503 B2 US 6826503B2
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Prior art keywords
voltage
measurement range
determined measurement
physical quantity
subtracted
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US10/602,816
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US20040010389A1 (en
Inventor
Yasuaki Makino
Toshio Ikuta
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Denso Corp
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Denso Corp
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Assigned to DENSO CORPORATION reassignment DENSO CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IKUTA, TOSHIO, MAKINO, YASUAKI
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
    • H03F3/45928—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit
    • H03F3/45968—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit by offset reduction
    • H03F3/45982—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit by offset reduction by using a feedforward circuit
    • H03F3/45986—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit by offset reduction by using a feedforward circuit using switching means, e.g. sample and hold
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/02—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation
    • G01D3/024—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation for range change; Arrangements for substituting one sensing member by another

Definitions

  • the present invention relates to physical quantity detection equipment for detecting physical quantity.
  • a physical quantity sensor for detecting a physical quantity such as pressure, temperature, and acceleration
  • a physical quantity sensor having a single measurement range is set to detect a large change in physical quantity
  • the sensor cannot detect a fine change in the physical quantity.
  • detection resolution of the sensor i.e., detection accuracy
  • the sensor is set to have high detection accuracy, the sensor cannot detect a large change in the physical quantity.
  • a physical quantity sensor 50 includes three sensing units 50 a - 50 c .
  • Each sensing unit 50 a - 50 c has a sensing device 51 a - 51 c , an amplifier 52 a - 52 c , and an output circuit 55 a - 55 c .
  • Each output circuit 55 a - 55 c connects to an electronic control unit (i.e., ECU) 30 through a wire harness, respectively.
  • ECU electronice.e., ECU
  • the amplifier 52 a in the sensing unit 51 a operates as a linear amplifier in the first measurement range between P 0 and P 1 , as shown in FIG. 9 .
  • the amplifier 52 b operates in the second measurement range between P 1 and P 2
  • the amplifier 52 c operates in the third measurement range between P 2 and P 3 .
  • the sensor 50 can detect a pressure change in a wide pressure range by switching a plurality of sensing units 50 a - 50 c having a different offset.
  • the senor 50 necessitates a plurality of sensing units 50 a - 50 c , so that both cost and size of the sensor 50 increase.
  • Physical quantity detection equipment includes a detector, an amplifier, an offset adjustment device, an addition device, and an output device.
  • the detector detects physical quantity and outputs a first voltage corresponding to the detected physical quantity.
  • the amplifier amplifies the first voltage.
  • the offset adjustment device determines a measurement range of the amplified first voltage among a plurality of predetermined measurement ranges, and outputs a second voltage corresponding to the determined measurement range.
  • the addition device subtracts the second voltage from the amplified first voltage, and outputs the subtracted amplified first voltage, which is in the determined voltage range.
  • the output device outputs the subtracted amplified first voltage to an outside circuit, and informs the determined measurement range to the outside circuit.
  • the outside circuit calculates the physical quantity based on the subtracted amplified first voltage and the determined measurement range.
  • a variable range of the subtracted amplified first voltage can be set comparatively large, so that the outside circuit detects the subtracted amplified first voltage accurately. Therefore, the equipment can detect the physical quantity in a wide range without decreasing the detection accuracy substantially. Thus, the equipment detects both a large and a fine change in the physical quantity.
  • the output device controls consumption current, which is current consumed in the output device and is supplied to the output device from the outside circuit.
  • the controlled consumption current corresponds to the determined measurement range so that the output device informs the determined measurement range to the outside circuit.
  • the output device supplies current to the outside circuit.
  • the supplied current corresponds to the determined measurement range so that the output means informs the determined measurement range to the outside circuit.
  • the output device modulates the subtracted amplified first voltage with a predetermined frequency corresponding to the determined measurement range, and outputs the modulated subtracted amplified first voltage to the outside circuit so that the output device informs both the subtracted amplified first voltage and the determined measurement range to the outside circuit.
  • the output device includes a first circuit for outputting the subtracted amplified output voltage to the outside circuit and a second circuit for outputting a range signal corresponding to the determined measurement range to the outside circuit.
  • a method for detecting physical quantity includes the steps of detecting physical quantity, so that a first voltage corresponding to the detected physical quantity is outputted, determining a measurement range of the first voltage among a plurality of predetermined measurement ranges, so that a second voltage corresponding to the determined measurement range is outputted, subtracting the second voltage from the first voltage, and outputting the subtracted first voltage and an information about the determined measurement range.
  • a variable range of the subtracted first voltage can be set comparatively large, so that the subtracted first voltage is detected accurately. Therefore, the physical quantity can be detected in a wide range without decreasing the detection accuracy substantially. Thus, both a large and a fine change in the physical quantity can be detected.
  • the subtracted first voltage and the information about the determined measurement range are detected by an outside circuit so that the outside circuit calculates the physical quantity based on the subtracted first voltage and the information about the determined measurement range.
  • the outputting step further includes the step of controlling consumption current, which is consumed in a circuit that provides the outputting step and is supplied from an outside circuit.
  • the consumption current corresponds to the determined measurement range so that the outside circuit calculates the physical quantity based on the subtracted first voltage and the determined measurement range.
  • the outputting step further includes the step of supplying current to an outside circuit.
  • the current corresponds to the determined measurement range so that the outside circuit calculates the physical quantity based on the subtracted first voltage and the determined measurement range.
  • the outputting step further includes the steps of modulating the subtracted first voltage with a predetermined frequency corresponding to the determined measurement range, and outputting the modulated subtracted first voltage to an outside circuit so that the outside circuit calculates the physical quantity based on the modulated subtracted first voltage.
  • FIG. 1 is a schematic diagram showing pressure detection equipment according to the first embodiment of the present invention
  • FIG. 2 is a partial diagram showing a switching circuit and an ECU according to the first embodiment
  • FIG. 3A is a graph showing a relationship between a final output voltage of an output circuit and detected pressure according to the first embodiment
  • FIG. 3B is a graph showing a relationship between the consumption current of a switching circuit and detected pressure according to the first embodiment
  • FIG. 4 is a schematic diagram showing pressure detection equipment according to the second embodiment of the present invention.
  • FIG. 5 is a partial diagram showing an output circuit and an ECU according to the second embodiment
  • FIG. 6 is a schematic diagram showing pressure detection equipment according to the third embodiment of the present invention.
  • FIG. 7 is a schematic diagram showing pressure detection equipment according to the fourth embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing a physical quantity sensor according to a related art.
  • FIG. 9 is a graph showing a relationship between an output voltage of the sensor and detected pressure according to the related art.
  • pressure detection equipment 10 includes a sensing device 11 , an amplifier 12 , a range-determination circuit 13 , an offset circuit 14 , an adder 15 , an output circuit 16 a , and a switching circuit 17 .
  • the equipment 10 connects to an electronic control unit (i.e., ECU) 30 through a wire harness.
  • ECU electronice control unit
  • the power source terminal 10 d , the ground terminal 10 e , and the signal terminal 10 f of the equipment 10 connect to the power source terminal 30 d , the ground terminal 30 e , and the signal terminal 30 f of the ECU 30 , respectively.
  • the sensing device 11 detects pressure by using a thin diaphragm (not shown), and outputs an initial output voltage in accordance with the detected pressure.
  • the amplifier 12 amplifies the initial output voltage inputted from the sensing device 11 .
  • the range-determination circuit 13 has a plurality of window comparators (not shown) for determining a measurement range of the amplified initial output voltage among a plurality of predetermined measurement ranges. When pressure is applied to the sensing device 11 , the range-determination circuit 13 determines the measurement range where the amplified initial output voltage belongs. Then, the range-determination circuit 13 outputs a range-determination signal in accordance with the determined measurement range.
  • Each window comparator has a threshold for defining each measurement range.
  • the first window comparator has the first threshold that provides the first measurement range between P 0 and P 1 , the second threshold for the second measurement range between P 1 and P 2 , and so on.
  • the amplified initial output voltage belongs to the first measurement range.
  • the range-determination circuit 13 After determining the measurement range, the range-determination circuit 13 outputs the range-determination signal, which provides information about the determined measurement range.
  • four measurement ranges P 0 -P 1 , P 1 -P 2 , P 2 -P 3 , P 3 -P 4 are provided, and a 3-bit signal is used as the range-determination signal.
  • the offset circuit 14 outputs an offset adjustment voltage in accordance with the range-determination signal inputted from the range-determination circuit 13 .
  • the offset adjustment voltage is zero.
  • the offset adjustment voltage is V 1 .
  • the offset adjustment voltage is 2 ⁇ V1, and so on.
  • the adder 15 subtracts the offset adjustment voltage from the amplified initial output voltage inputted from the amplifier 12 .
  • the output circuit 16 a receives a subtracted output voltage inputted from the adder 15 , and outputs the subtracted output voltage as a final output voltage to the ECU 30 .
  • the final output voltage outputted from the output circuit 16 a changes between zero volt and V 1 volt in each measurement range P 0 -P 1 , P 1 -P 2 , P 2 -P 3 , P 3 -P 4 , as shown in FIG. 3 A.
  • the range determination circuit 13 has a hysteresis characteristic of the range-determination signal This hysteresis characteristic prevents the final output voltage from fluctuating. Moreover, the hysteresis characteristic prevents consumption current consumed in the switching circuit from fluctuating.
  • a pressure-output voltage curve has a hysteresis characteristic, as shown in FIG. 3 A.
  • the final output voltage from the output circuit 16 a is inputted to the ECU 30 through the wire harness. Since the final output voltage changes between zero volt and V 1 volt in each measurement range, P 0 -P 1 , P 1 -P 2 , P 2 -P 3 , P 3 -P 4 , the ECU 30 is required to recognize the measurement range where the output voltage belongs so as to calculate the amplified initial output voltage of the amplifier 12 . In this case, if the range-determination signal from the range-determination circuit 13 is simply inputted to the ECU 30 , many wire harness between the pressure detection equipment 10 and the ECU 30 is necessitated.
  • the switching circuit 17 for switching the consumption current enables the ECU 30 to detect the determined measurement range of the final output voltage without increasing the wire harness.
  • the consumption current is current consumed in the switching circuit 17 , and corresponds to the determined measurement range.
  • the switching circuit 17 controls the consumption current so as to correspond to the determined measurement range.
  • the switching circuit 17 includes three switches 17 a - 17 c , and three constant current circuits 17 d - 17 f .
  • Each switch 17 a - 17 c switches on and off according to the 3-bit signal as the range-determination signal inputted from the range-determination circuit 13 .
  • a different constant current flows in each constant current circuit 17 d - 17 f , so that the consumption current consumed in the switching circuit 17 can be switched eight ways by a combination of on/off switching of the switches 17 a - 17 c .
  • the consumption current changes from I 1 to I 4 in accordance with the measurement range P 0 -P 1 , P 1 -P 2 , P 2 -P 3 , P 3 -P 4 .
  • the ECU 30 supplies the consumption current to the switching circuit 17 through a resistor 301 , as shown in FIG. 2 .
  • a terminal voltage between two ends of the resistor 301 also changes in accordance with the consumption current. Therefore, the measurement range of the final output voltage corresponding to the consumption current can be detected by measuring the terminal voltage between two ends of the resistor 301 .
  • the ECU 30 has a microcomputer 300 (i.e., MC).
  • the microcomputer 300 detects the final output voltage outputted from the output circuit 16 a and the terminal voltage of the resistor 301 through a built-in type or exterior type A/D converter (not shown).
  • the microcomputer 300 recognizes the determined measurement range of the final output voltage by detecting the terminal voltage so that the microcomputer 300 calculates the detected pressure based on the final output voltage and the determined measurement range.
  • a variable range of the final output voltage in each measurement range is between zero and V 1 , so that the variable range of the final output voltage can be set comparatively large. Therefore, the ECU 30 can detect the final output voltage accurately, so that the pressure is detected accurately. Moreover, the equipment 10 can detect pressure in such a wide range between P0 and P4 without decreasing the detection accuracy substantially and without adding a new sensing device. Thus, the equipment 10 having only one sensing unit detects both a large and a fine change in pressure.
  • the ECU 30 can detect the range-determination signal without adding a new signal wire, i.e., the new wire harness, between the pressure detection equipment 10 and the ECU 30 .
  • the pressure detection equipment 10 includes the sensing device 11 , the amplifier 12 , the range-determination circuit 13 , the offset circuit 14 , the adder 15 , and an output circuit 16 b , as shown in FIG. 4 .
  • the subtracted output voltage from the adder 15 i.e., the offset adjusted output voltage, and the range-determination signal from the range-determination circuit 13 are inputted to the output circuit 16 b .
  • the output circuit 16 b outputs the final output voltage to the ECU 30 , and controls a current supply capability in accordance with the range-determination signal.
  • the output circuit 16 b includes an operational amplifier 167 , three switches 161 - 163 , and three constant current circuits 164 - 166 .
  • the input terminal of the operational amplifier 167 connects to the adder 15 , and the output terminal of the operational amplifier 167 connects to the constant current circuits 164 - 166 and the signal terminal 10 f .
  • the operational amplifier 167 outputs the final output voltage in accordance with the subtracted output voltage to the ECU 30 through the signal terminal 10 f , 30 f .
  • Each switch 161 - 163 is controlled by a 3-bit signal of the range-determination signal, so that current flowing through each constant current circuit 164 - 166 is controlled.
  • each current flowing through the constant current circuit 164 - 166 is different from each other.
  • the total current as the constant current flowing through the output circuit 16 b changes eight ways by a combination of on/off switching of three switches 161 - 163 , so that the output circuit 16 b outputs the constant current in eight ways.
  • the constant current expresses the current supply capability, i.e., the range-determination signal.
  • the ECU 30 has the microcomputer 300 , a resistor 302 , and a switch 303 .
  • the resistance of the resistor 302 is sufficiently smaller than the output impedance of the operational amplifier 167 .
  • the microcomputer 300 detects both the final output voltage and the range-determination signal as follows.
  • the switch 161 in the output circuit 16 b switches on, and residual two switches 162 , 163 switch off, according to the range-determination signal.
  • the switch 303 in the ECU 30 switches off.
  • the current flowing through the constant current circuit 164 is absorbed into the operational amplifier 167 through a channel Ia, because the output terminal of the operational amplifier 167 has low impedance, so that the current is absorbed as an excess current.
  • the microcomputer 300 detects the final output voltage outputted from the output circuit 16 b corresponding to the subtracted output voltage.
  • the current flowing through the constant current circuit 164 flows into the resistor 302 through the signal terminals 10 f , 30 f because the resistance of the resistor 302 is sufficiently smaller than the output impedance of the operational amplifier 167 .
  • the final output voltage inputted into the microcomputer 300 changes.
  • This changed output voltage provides the product of the current flowing through the constant current circuit 164 and the resistance of the resistor 302 . Therefore, the current can be calculated from the changed output voltage.
  • the current expresses the current supply capability, i.e., the range-determination signal.
  • the ECU 30 controls the switch 303 to switch on/off temporally, so that the ECU 30 detects the final output voltage and the range-determination signal. Thus, the ECU 30 calculates the pressure based on the final output voltage and the range-determination signal.
  • variable range of the output circuit 16 b can be set comparatively large. Therefore, the ECU 30 can detect the output voltage from the output circuit 16 b accurately so that the pressure is detected accurately. Moreover, the equipment 10 can detect pressure in such a wide range between P 0 and P 4 without decreasing the detection accuracy substantially and without adding a new sensing device. Thus, the equipment 10 having only one sensing unit detects both a large and a fine change in pressure. Further, the ECU can detect the range-determination signal without adding a new signal wire between the pressure detection equipment 10 and the ECU 30 .
  • the pressure detection equipment 10 includes the sensing device 11 , the amplifier 12 , the range-determination circuit 13 , the offset circuit 14 , the adder 15 , an output circuit 16 c , and an oscillation circuit 18 , as shown in FIG. 6 .
  • the oscillation circuit 18 outputs a sine wave having a predetermined frequency in accordance with the range-determination signal from the range-determination circuit 13 .
  • the output circuit 16 c modulates the subtracted output voltage, i.e., the final output voltage, by using the sine wave, so that the output circuit 16 c outputs the modulated sine wave. Therefore, the predetermined frequency in accordance with the range-determination signal is superimposed on the final output voltage.
  • the ECU 30 includes a frequency counter (not shown) and a filter (not shown).
  • the frequency counter detects the superimposed frequency, i.e., the predetermined frequency.
  • the predetermined frequency expresses the range-determination signal.
  • the superimposed frequency is eliminated by the filter, so that the ECU 30 can detect an analogue signal corresponding to the final output voltage. Therefore, the ECU 30 calculates the pressure based on the final output voltage and the range-determination signal.
  • variable range of the output circuit 16 c can be set large, so that the ECU 30 can detect the output voltage from the output circuit 16 c accurately. Further, the equipment 10 detects both a large and a fine change in pressure. Moreover, the range-determination signal corresponds to the superimposed frequency, which is superimposed on the final output voltage. Therefore, the ECU 30 can detect the range-determination signal without adding a new signal wire between the pressure detection equipment 10 and the ECU 30 .
  • the pressure detection equipment 10 includes the sensing device 11 , the amplifier 12 , the range-determination circuit 13 , the offset circuit 14 , the adder 15 , an output circuit 16 d , and a generation circuit 19 , as shown in FIG. 7 .
  • the power supply terminal 10 d , the ground terminal 10 e , and the signal terminal 10 f - 10 i in the pressure detection equipment 10 connect to the power supply terminal 10 d , the ground terminal 10 e , and the signal terminal 10 f - 10 i in the ECU 30 through the wire harness, respectively.
  • the generation circuit 19 converts the range-determination signal so that the converted range-determination signal adjusts to a specification of system in the ECU 30 .
  • the range-determination signal is a 3-bit signal
  • the lowest output range of the ECU 30 is expressed as “111”
  • the range-determination signal is expressed as “000”
  • the generation circuit 19 converts the range-determination signal to “111”.
  • the output circuit 16 d outputs the final output voltage to the ECU 30 .
  • the ECU 30 detects the final output voltage and the converted range-determination signal.
  • the ECU 30 calculates the pressure by adding the offset adjustment voltage in accordance with the range-determination signal to the final output voltage.
  • variable range of the output circuit 16 d can be set large, so that the ECU 30 can detect the output voltage from the output circuit 16 c accurately. Further, the equipment 10 detects both a large and a fine change in pressure. Moreover, the ECU 30 can detect the range-determination signal without adding a new signal wire between the pressure detection equipment 10 and the ECU 30 .
  • the range-determination circuit 13 the offset circuit 14 , the adder 15 , and the like are constructed by discrete circuits, they can be constructed by software.
  • the sensing device 11 provides a pressure sensor
  • other physical quantity sensors can be used as the sensing device 11 .
  • the physical quantity sensor detects a physical quantity, such as temperature, acceleration, and humidity.

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  • Engineering & Computer Science (AREA)
  • Technology Law (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
US10/602,816 2002-07-11 2003-06-25 Physical quantity detection equipment Expired - Lifetime US6826503B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-202902 2002-07-11
JP2002202902A JP4224993B2 (ja) 2002-07-11 2002-07-11 物理量検出装置

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US20040010389A1 US20040010389A1 (en) 2004-01-15
US6826503B2 true US6826503B2 (en) 2004-11-30

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JP (1) JP4224993B2 (ja)
DE (1) DE10331078B4 (ja)
FR (1) FR2842295B1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7365452B2 (en) 2002-10-18 2008-04-29 Denso Corporation Sensor device and output characteristic switching method of sensor device

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JP4437531B2 (ja) * 2004-02-20 2010-03-24 アイシン精機株式会社 能動型防振制御システムにおける制御データの設定方法及び制御方法
ES2579428T3 (es) * 2004-05-07 2016-08-11 Kistler Holding Ag Sistema de medición con salidas de sensibilidades diferentes
DE102005006402B3 (de) * 2005-02-11 2006-08-31 Siemens Ag Sensorvorrichtung und System
JP2007278725A (ja) * 2006-04-03 2007-10-25 Denso Corp 物理量センサ
JP4835727B2 (ja) * 2009-06-09 2011-12-14 株式会社デンソー センサシステム
CA2813656C (en) 2010-10-29 2023-09-26 Orpyx Medical Technologies Inc. Peripheral sensory and supersensory replacement system
JP6102377B2 (ja) * 2013-03-15 2017-03-29 オムロン株式会社 センサ
BR112015028905A2 (pt) * 2013-05-21 2017-07-25 Orpyx Medical Tech Inc conjunto de aquisição de dados de pressão, e, método de adquirir dados de pressão
CN104883134B (zh) * 2014-02-27 2018-11-27 无锡华润上华科技有限公司 一种陀螺仪前置放大电路和电子装置
CN104075735B (zh) * 2014-07-03 2017-02-15 湖北航天技术研究院总体设计所 惯性测量装置自诊断方法及装置

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US4488439A (en) * 1981-08-08 1984-12-18 Robert Bosch Gmbh Mass flow meter with vibration sensor
US4763973A (en) * 1985-02-27 1988-08-16 Omron Tateisi Electronics Co. Waveguide-type optical sensor
US5103171A (en) * 1989-08-11 1992-04-07 U.S. Philips Corporation Adaptive measuring apparatus with automatically adjustable window comparator
US6477903B2 (en) * 1990-10-12 2002-11-12 Kazuhiro Okada Force detector and acceleration detector and method of manufacturing the same
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US5770883A (en) * 1995-09-19 1998-06-23 Nippondenso Co., Ltd. Semiconductor sensor with a built-in amplification circuit
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Publication number Priority date Publication date Assignee Title
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FR2842295A1 (fr) 2004-01-16
FR2842295B1 (fr) 2006-08-18
US20040010389A1 (en) 2004-01-15
DE10331078B4 (de) 2012-03-01
JP2004045209A (ja) 2004-02-12
JP4224993B2 (ja) 2009-02-18
DE10331078A1 (de) 2004-01-22

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